On Mon, 2009-12-21 at 23:50 +0100, Richard Hartmann wrote: > On Mon, Dec 21, 2009 at 23:28, Uoti Urpala <uoti.urpala at pp1.inet.fi> wrote: > > Well it's kind of hard to say anything when the only information about > > the problem is "far from smooth". > > I am more than happy to give you any and all information you need, > you just need to tell me what you do and how to get it :) You said that playback "gets choppy when a lot of detail is in the video", but also "playback is far from smooth". So is it isolated cases of "choppiness", or are there constant problems? > > Does the A-V value shown on the status > > line stay at 0? > > It is between 0.000 and -0.001. And it stays there also during any particularly "choppy" parts? > > Does the VDPAU benchmark result change if you use "-vo > > vdpau:fps=-1"? > > Gut feeling is no, see below for the benchmark for > > -vo vdpau:fps=-1 -vc ffh264vdpau -fs You could also check that this makes no difference for the A-V value during any "choppy" parts - the sync/drop behavior could perhaps make the effect of individual particularly slow to decode frames less apparent on the status line by allowing faster recovery. I'm not sure what else to check. If the choppiness really does depend on there being "a lot of detail in the video" then that points to some kind of a performance problem; but OTOH I'd expect a decoding performance problem to be visible in MPlayer's A-V value, and it staying around +-0.001 means that to MPlayer it looks like things are happening fast enough. Another possibility is some VDPAU driver problem. Make sure you're using the overlay rather than blit queue of VDPAU if possible. The main reason VDPAU would fall back to the blit version if is you have the composite extension enabled in X (even if you're not running a compositing window manager). One simple way to check which one is being used is to suspend MPlayer with ctrl-Z (so it can't redraw its window) and then move another window over MPlayer's output window. If the window contents stay intact then it's the overlay queue; if they're lost when hidden from view then it's the blit version.
